Cryptanalysis and Improvements of an Anonymous Multi-Receiver Identity-Based Encryption Scheme

Multi-receiver communication is of great importance in wireless communications. It deals with the problem of key management effectively such that the entire communication protocol is efficient. Many researchers focused on this topic and proposed many interesting protocols. In an Identity-Based Encryption (IBE) scheme, every user can select their IDentity (ID) freely, where some meaningful or easily memorized strings are usually selected as ID. Moreover, the problem of the authentication for public keys can also be solved if the authors take ID to form the public keys.